The Purdue's Owl is a helpful online resource for Chicago citation.
When you use outside sources, you will need to create a Bibliography that tells your reader all the information they need to go find the source themselves if they want to. Commonly used sources include:
BOOKS (NOTE: do not use bolded font)
Cornish, Dudley Taylor. The Sable Arm: Black Troops in the Union Army, 1861-1865. Lawrence: University Press of Kansas, 1987.
JOURNAL ARTICLES (online) (NOTE: indent second line to .5" & do not use bolded font)
Castel, Albert. “The Fort Pillow Massacre: A Fresh Examination of the Evidence.” Civil War History 4, no. 1 (1958): 37. http://doi.org/ 50.10.1353/cwh:1958.0059
Satalkar, Bhakti. “Water Aerobics.” Buzzle.com. July 15, 2010. www.buzzle.com.
Librarians have created guides with examples of commonly used citation styles. The citation style you use depends on the academic discipline of your class and the instructor's preference.
Typically, English, history, language arts, cultural studies, and other humanities disciplines use MLA.
Social Sciences, such as psychology, linguistics, sociology, economics, criminology, business, library science and nursing commonly use APA.
Some community college instructors require students to use CMOS, or Chicago Manual of Style, but you may encounter it at universities if you study literature, history, and the arts.
The Council of Science Editors (CSE) scientific style used for citing sources in the sciences, including biology, chemistry, computer science, engineering, geology, mathematics and physics
Your professors will include which citation style they expect you to use in the syllabus, or you can ask which citation style they would like you to use.